Universal Aluminized Steel Round Muffler Delete Pipe by Different Trend®. Muffler Inlet Diameter: 4". Muffler Outlet Diameter: 4". Length: 30". Different Trend provides variety of product selections, premium quality products, superior value, and the best in customer service. This product is made of high-quality materials to serve you for years to come. Designed using state-of-the-art technology and with customers in mind.